Question

According to the pressure-flow hypothesis, which of the following statements is not true?
-Water moves from the xylem to the phloem of a plant
-water is necessary for sugars to move through phloem
-Ploem is able to move sugars in either direction to meet the nutritional needs of plants
-the movement of water into a nutrient-rich region of the phloem decreases the pressure in that region

Answer 1

The Pressure Flow Hypothesis, also known as the Mass Flow Hypothesis, is the best-supported theory to explain the movement of food through the phloem.[1] It was proposed by Ernst Munch, a German plant physiologist in 1930.[2] A high concentration of organic substance inside cells of the phloem at a source, such as a leaf, creates a diffusion gradient (osmotic gradient) that draws water into the cells. Movement occurs by bulk flow (mass flow); phloem sap moves from sugar sources to sugar sinks by means of turgor pressure, also known as hydrostatic pressure. A sugar source is any part of the plant that is producing or releasing sugar. During the plant's growth period, usually during the spring, storage organs such as the roots are sugar sources, and the plant's many growing areas are sugar sinks. The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).
Now by knowing this, what do you think is the answer?

Answer 2

What's the answer then?...I could not figure it out, even with that much writing, especially with that much writing... :/

Answer 3

read the passage and then start eliminating choicesthe one that isnt in the passage is the answer.

Answer 4

It's D.